Do not fancy 133 volts to earth on the shell of an E27 lamp
Any vaguely modern E27 holders don't have the outside contact really any more exposed than the centre one. Rather than the old system of the thread of the holder being metallic and connected to N, nowadays the holder's thread is insulating with a contact for the outer positioned at the base of holder alongside the centre one. The lamp cap itself is shrouded when in position - so it can't be touched when the lamp is screwed fully home, and when loosened is disconnected from both contacts before the cap becomes exposed. There's still the problem of an empty holder - but that's the same with the BC system.
Do not fancy 133 volts to earth on the shell of an E27 lamp
Any vaguely modern E27 holders don't have the outside contact really any more exposed than the centre one. Rather than the old system of the thread of the holder being metallic and connected to N, nowadays the holder's thread is insulating with a contact for the outer positioned at the base of holder alongside the centre one. The lamp cap itself is shrouded when in position - so it can't be touched when the lamp is screwed fully home, and when loosened is disconnected from both contacts before the cap becomes exposed. There's still the problem of an empty holder - but that's the same with the BC system.
